Add polymer.json and move lint settings to it.

Change-Id: I84a9901695a3b9a7bb85b1bb275469cde86fd174

polygerrit-ui/app/BUILD

@@ -125,6 +125,7 @@ sh_test(
     size = "large",
     srcs = ["polylint_test.sh"],
     data = [
+        "polymer.json",
         ":pg_code_without_test",
         "//polygerrit-ui:polygerrit_components.bower_components.zip",
     ],

polygerrit-ui/app/polylint_test.sh

@@ -25,4 +25,7 @@ fi
 
 unzip -o polygerrit-ui/polygerrit_components.bower_components.zip -d polygerrit-ui/app
 
-$polymer_bin lint --root polygerrit-ui/app --entrypoint polygerrit-ui/app/elements/gr-app.html --component-dir 'polygerrit-ui/app/bower_components' --verbose --rules polymer-2-hybrid --sources "polygerrit-ui/app/**/*"
+#Can't use --root with polymer.json - see https://github.com/Polymer/tools/issues/2616
+#Change current directory to the root folder
+cd polygerrit-ui/app
+$polymer_bin lint --component-dir 'bower_components' --verbose

polygerrit-ui/app/polymer.json

@@ -0,0 +1,13 @@
+{
+  "entrypoint": "elements/gr-app.html",
+  "sources": [
+    "behaviors/**/*",
+    "elements/**/*",
+    "scripts/**/*",
+    "styles/**/*",
+    "types/**/*"
+  ],
+  "lint": {
+    "rules": ["polymer-2-hybrid"]
+  }
+}